Pilot screen for pot type burners



Dec. 14, 1943.

J. L. BREESE PILOT SCREEN FOR POT TYPE BURNERS Filed Ju ly 11, 1941 7 Ow m o m g 0 W N O .FJI/ 7 v/ H Q \\l 0 w o 4 s 4/ O W m l o A n O 8 Al. 6

Z 3 Z P 1 I72 0??? 50/" 4 James .2257665? y WM M .iziarrzeyar means, herein Patented Dec. 14, 1943 ofrsica PILGT SCREEN FUR POT TYPE BURNEBS James nership of Illinois Application July 11, 1941, Serial No. 401,922

L. Breese, Santa Fe, N. Oil Devices, Santa Fe, N. Mex.,

Mex, assignor to a limited part- 4 Claims. (01. 158 91) toan improvement in but notlimited to pot My invention relates pilot means applicable type burners'ior burningliquid hydrocarbons.

Fig. 4 is' a view of a still further variant screen member, on a slightly reduced scale; and

Fig. 5 is a section on on an enlarged scale.

Like parts are ndicated by like symbols throughout the specification and drawing.

Referring to the drawing, l generally indicates any suitable outer drum or base member, which may extend upwardly, as at 2, to provide a combustion or radiating chamber. the angle ring 3 within the base i is a pot having a slightly concave bottom member 5. The pot wall is provided with a plurality of primary air inlet apertures 6 Any suitable means 'may be employed for, providing secondary air. I illustrate, however, a plurality of both larger and more closely spaced secondary air inlet apertures 71 located adjacent the top of the pot.

The outer flange 8 of the pot t rests upon the angle ring 3. 9 is a bottom member for the base l,-having a central air inlet aperture to, whereby air is admitted to the space between the member i and the pot 6. H is any suitable liquid fuel or oil inlet ple by a valve generally indicated as l2. It will be understood that any suitable means, automatic or manual, may beemployed for controlling the flow of fuel to the pot.

I5 is any suitable shown as a plurality of inwardly extending pins. Referring for example toFig, 2,

1 illustrate a bafile member in the form of a ring.

the line 5-5 of Fig. 4,

located at various levels.-

means, controlled for exambaffle or screen supporting Mounted upon V trative or diagrammatic, rather than in or above the pot if desired, employ a plurality of transversely ex tending rods or wires ll. Preferably th wires are thin and may necessitate the employment of a surrounding ring Hi, to which they are welded or otherwise secured. As a further form, of baille member I may employ a preferably flat disc l9 having therein a plurality of air inlet] apertures 20, which are herein shown as generally uniformly distributed throughout its area. 2| is any suitable flame ring for the top of the pot, having a central outlet aperturejZ.

Itwill be realized that, whereas'I have described and illustrated a practical and operative device, nevertheless many changes maybe made in the size, shape, number and disposition of parts without departing from the spirit of my invention. I therefore wish my description and drawing to be takenas in.a broad sense illusas limiting me to my precise showing.

The use and operation of my invention are as follows:

In the employment of pot type burners oi the type herein shown,

the flame is controlled. pre-= vailingly by varying the rate of supply of liquid fuel along the line H to the pot. When amenmum supply is delivered to the pot, and assuming that combustion is already under way, the supply of liquid hydrocarbon is sufiicient to provide a gaseous fuel vaporized by the heat ofcombustion to raise the combustionlevel to or above the flame ring 2 I. However, it is decombustion at a low sirable to provide a low turndown or pilot stage, as burners of this typemay be intermittently em= ployed or may be turned down in warmer weather, I find that, if I employ a screen or baflle having a large number of more or less time, forrnly arranged apertures or spaces, the screen is efiective, when the supply of fuel is reduced to the pilot stage," to prevent dowrr drafts of air -from above and to permit the maintenance of stage in the bottom or the e pot'without any disadvantageous deposit of vfree IE, to which is secured in any suitable manner carbon.

1 find it voids or spaces to the roughly, one to three.

desirable to have the. relation of the In other words, it about twenty-five percent of the baflle or screen is open,

it serves very well as a means for preventing distributing down drafts or eddy currents, and] stabilizes combustion in the lower part of the pot at a low level, without deposit of free carbon. Iclaimz, p 1. In combination, a burner pot having a wall with a plurality of-primary solidpart of the screen,

air inlet apertures located at various levels therein, means for supplying a liquid fuel to the interior of the pot in controllable volumes, the pot having one or more secondary air inlets adjacent its top, and a screen located intermediate the top and bottom of the pot for limiting downward movement of air in the pot at lower stages of combustion, said screen extending from side to side of the pot and having therein a plurality of generally uniformly distributed apertures.

2. In combination, a burner pot having a wall with a plurality of primary air inlet apertures located at various levels therein, means for supplying a liquid fuel to the interior of the pot in controllable volumes, means for supplying secondary air to the vaporized hydrocarbon, said means being located adjacent the top of the pot, and a screen located intermediate the top and bottom of the pot for limiting downward movement of air in the pot at lower stages of cornbustion, said screen extending from side to side of the pot and having therein a plurality of generally uniformly distributed apertures, the relative cross sectional area of said apertures being of the order of twenty-five percent of the entire area of the screen.

3. In combination, a. burner potnhaving a wall 1 with a plurality of primary air inlet apertures tive cross sectional area of ondary air to the vaporized hydrocarbon, said means being located adjacent the top of the pot, and a screen located intermediate the top and bottom of the pot for limiting downward movement of air in the pot at lower stages of combustion', said screen extending from side to side of the pot and having therein a plurality of generally uniformly distributed apertures, the relasaid apertures being of the order of twenty-five percent of the entire area of the screen, and a reinforcing ring extending circumferentially about said screen.

4. In combination, a burner pot having a wall witha plurality of primary air inlet apertures located at various levels therein, means for supplying a liquid fuel to the interior of the pot in controllable volumes, the pot having one or more secondary air inlets adjacent its top, and a wire mesh screen located intermediate the top and bottom of the pot for limiting downward movement of air in the pot at lower stages of combustion,-said screen extending from side to side of the pot and having therein a plurality of generally uniformly distributed apertures.

A JAMES L. BREESE. 

